title	description
The SDS-DRDB module	The SDS-DRBD module: General Concepts and Principles.

{% alert level="warning" %} The module is guaranteed to work only in the following cases:

• if stock kernels shipped with the supported distributions are used;
• if a 10 Gbps network is used.

As for any other configurations, the module may work, but its smooth operation is not guaranteed. {% endalert %}

This module manages replicated block storage based on LINSTOR and the DRBD kernel module and allows to create a Storage Pool in Linstor and a Storage Class in Kubernetes by creating Kubernetes custom resources. LINSTOR is an orchestrator that acts as an abstraction layer. It:

• automates volume creation using well-known and proven technologies such as LVM and ZFS;
• configures volume replication using DRBD.

The SDS-DRBD module makes it easy to use LINSTOR-based storage in your cluster. Once you enable the SDS-DRBD module in your Deckhouse configuration, your cluster will be automatically configured to use LINSTOR. All that remains is to create a Storage pool (link).

Two modes are supported: LVM and LVMThin.

Each mode has its advantages and disadvantages. Read FAQ to learn more and compare them.

Note that the module's Kubernetes custom resources are Cluster-scoped.